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Mixed convection in the heated semi-circular lid-driven cavity for non-Newtonian power-law fluids: Effect of presence and shape of the block

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Chinese Journal of Chemical Engineering 2020年第5期28卷 1225-1240页

作者： Krunal M.Gangawane Hakan F.Oztop Department of Chemical Engineering National Institute of Technology RourkelaRourkela 769008OdishaIndia Department of Mechanical Engineering Engineering FacultyFirat UniversityElazig TR-23119Turkey

The present work delineates the hydrodynamics and thermal characteristics due to mixed convection in the liddriven semi-circular cavity affected by the presence of the adiabatic block at its geometric center for twodimensional,steady-state,laminar and for non-Newtonian power-law *** semi-circular cavity has a diameter of *** horizontal wall/lid is sliding with a uniform horizontal velocity(u=U)and is subjugated to the ambient thermal condition;while the curved surface is subjugated to a higher isothermal *** convective characteristics inside the system is explored for the broad range of Richardson number(0.1≤Ri≤10),Prandtl number(1≤Pr≤100)and non-Newtonian power-law index(0.5≤n≤1.5)at a constant Grashof number of 10~*** from this,the effect of shape(cross-section)of the inserted block,i.e.,circular,square and triangular on heat transfer characteristics has also been *** is observed that the shear thickening fluids display better cooling ***,the cavity with immersed triangular block shows better heat transfer results than the circular and square *** deviations observed in the flow and heat transfer characteristics in the cavity by inserting an adiabatic block as compared with cavity without block have been ascertained by calculating normalized Nusselt number(Nu^N).The presence of the block was found to have a diminishing effect on the heat transfer due to convection in the *** the end,the results of the study are summarized in the form of a predictive correlation exhibiting the functional dependence of average Nusselt number with Prandtl number,power-law index,and Richardson number.

关键词： Heat transfer enhancement Semi-circular cavity adiabatic block Non-Newtonian fluids

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